Q: While driving my engine stutters and tries to cut out at 4000 rpm.

你好呀。发动机正在减少排气系统中的高背压。催化转换器或消音器可能会被插入，从而导致发动机产生过多的背压，并且当发动机以4,000 rpm的速度运行时，压力可能太高。用覆盖管道的东西在闲置时检查排气管，并以4,000 rpm的速度再次检查排气管，看看压力下降还是保持不变。如果您需要进一步的帮助engine stalling以4,000 rpm的速度出局，然后寻找一个专业人士，例如您的机械师，以帮助您。

This may be a sign of a faulty MAP sensor. The Manifold Absolute Pressure (MAP) sensor senses engine load and generates a signal that is proportional to the amount of vacuum in the intake manifold. The engine computer then uses this information to adjust ignition timing and fuel enrichment. When the engine is working hard, intake vacuum drops as the throttle opens wide. The engine takes in more air, which requires more fuel to keep the air/fuel ratio in balance. When the computer reads a heavy load signal from the MAP sensor, it adjusts the fuel mixture to slightly more rich than normal so the engine can produce more power. The computer will then retard (back off) ignition timing slightly to prevent detonation (spark knock) that can damage the engine and decrease performance. This may also be caused by other closely related components such as a dirty or failing mass air-flow sensor, a faulty throttle position sensor or potentially a vacuum leak. I would recommend having an expert from YourMechanic come to your location to诊断并更换您的地图传感器.